Edge-trimming machine



H. D. WEBB.

EDGE TRIMMING MACHINE. APPLICATION FILED APR. 24, 1919.

; Patented May 16, 1922.

2 SHEETS-SHEET l.

msou: FORMERLY ymmmso TO THIS CONTOUR.

CONTOUR OF H EELSEAT OF LA$T.

I INSOLE NOW THIMMED TO THIS CONTOUR.

Fig.8.

//v VE/V ma.

H. D. WEBB.

EDGE TRIMMING MACHINE.

APPLICATION mzo APR- 24. 1919.

Patented May 16,1922.

2 SHEETS-SHEET 1.

EFFECTIVE GUIDIM PORTIONS 54 40 OF LAST AT mom OF HEEL EFFECTIVE GUIDING um:

M-MM

UNITED STATES PATENT OFFICE.

HORACE D. wnBacr noonns'rna, NEW YORK, ASSIGNOR To UNITED SHOEMACHIN- ERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

To all, whom it him concern Be it known that LllonAor. D. WEBB, a citizen of the United States, residing at :lmhester, in the county of Monroe and Stateot New York, have invented certain Improvements in Edge-Trimming Machines, of which the following description, in connection with the accompanying drawings, is a specification, like reierence characters on the drawings indicating like pasts in the several figures.

This invention relates to that class of shoe machines commonly known as edge-trimming machines, and moreespecially to machines designed for trimming the edge of the heel-seat portion of an insole that is attz'lched to a last.

in the art of shoemaking it is a common (practice to trim the edge of an insole approximately to the contour of the heel-seat j tairtion of the last prior to assembling the shoe-upper with the last and insole. The present ii'ivontion is directed more especially to this step in shoemalring, and its objects, briefly stated, are to improve the results and to simplify the mecl'ninism required to obtain a satisfactory measure of efiiciency.

lzleretotore it l'uitsbeen imrmssil'ile to trim the edge oi the heel-seat portion of an insole without leaving shoulders at the points where such ta'imming began and ended, and. it is an object of this invention to provide improved means for controlling the trimming sons to prevent the formation of such shoulders. t Devices heretofore provided for guiding the work for this operation have permitted the cutter to follow the contour of the heelseat oi the last throughout too great a. portion of the length of the heel-seat, with the result that the divergent portions of the trimmed edge have been at the front of the heel-seat portion and separate from the curve 0t minimum radius around the heelend. This is objectionable because it emphasizes the excessive width of the insole at the shank portion. Accordingly another object of this inventionis to provide means torguiding the work so that the diverging portions of the trimmed edge will begin nearer the heehend and merge with the curve of minimum radius at the heel-end.

The accompanying drawings show one embodiment of the invention as comprising means constructed and arranged to co-act with the side of a last to which an insole is nnon-rnnvnvrmonnonmn:

Specification of Letters Patent. Patented May 16, 1922 Application filed April 24, 1919. Serial l lo. 292,336.

attached, to position the work and to guide it relatively to the trimming cutter in such manner that the line of trimming will follow the edge of the last around the heel-end and diverge, relatively to the edge, from the curve of minimum radius to points at or near the breast line.

An important consideration of the invention is to obtain the results stated without dependence upon any guiding or controlling means extraneousto the means that traverses the side ofthe last. In obtaining the results sought the peculiarities of the average last have been taken into account in devising a gage that will utilize and compensate for thosepeculiarities. For example, the edge of the heel-seat portion of a last does not conform ,to the widest part of the lastthrough the heel portion, the last being undorcut at the heel portion, and the degree of such undercut being greater at some points than at others. The maximum degree of undercut is at the front of each side of the heel-part, and the points of minimum wider-cut are between the extreme front and rear ends of the heel-part. These peculiarities increase the difliculty of guiding the last insuch a way as to trim closely to the edge of the last throughout the rear end segment defined approximately by the pointsoii least undercut, and also to trim along lines that diverge from said points toward the front of the heel-part, but a gage that embodies the subject-matter of the present invention will control the trimming so as to produce this result.

A, characteristic feature of the illustrated gage that distinguishes it from prior gages for this purpose is that it comprises two separate cooperative abutinents arranged to traverse a common line of contact along the side of the last. one of said portions being arranged to maintain point contact with the last in advance of the point of cut and the other being arranged. to maintain point contact behind the point of cut. As the last is held and moved in, contact with these two abutments the constantly changing degree of plan curvature of the last effects a gradual and protracted bodily movement of the work toward or from the cutter. One advanta geous result of embodying a gage constructlast.

movement. Another is that this relative movement is' controlled positively by the varying plan curvature of the last as the point of cut progresses. The critical action being thus controlled automatically by the changing curvature of the last in conjunction with the two separated abutments of the gage relieves the operator from the necessity for special manipulation to accomplish the end sought.

Another feature of the'invention consists in constructing and arranging the gage so that it will oscillate or in any other suitable manner move in response to angular motion of the last and thus accommodate itself, as to posit-ion, to any position assumed by the Thus, if the last be mounted upon a movable work-support having a pin arranged to occupy the socket in the heel-part of the last so that the last may execute angular movement about the axis of said pin, the point of contact between the cutter and the work will move about the axis of the cutter; This condition is amply cared for, according to this invention, by mounting the gage so that it will turn about an axis, preferably one approximately coincident with that of the cutter, and, conse quently, as the point of cut moves about the axis oflthe cutter the gage will execute a corresponding angular movement incidental to maintaining its contact with the side of the last at two separate points, as hereinbefore explained.

I Still another object ofthe invention is to provide means for returning the gage automatically to the most convenient initial position for starting a trimming operation, and, in accordance with this object, the gage is provided with suitable springs that serve to return the to an intermediate position. between the two extreme positions of angular movement, as soon as the last is disengaged from the gage.

The features hereinbefore outlined, and others that will be explained in due course, are illustrated by the accompanying drawings and are hereinafter claimed.

Referring to the accompanying drawings which show one embodiment of the present invention,-

Fig 1 represents a front elevation of the upper portion of a machine for trimming the heel-seat portion of an insole attached to a last;

Fig. 2 represents a front elevation on a larger scale of the gage in its normal or initial position, and includes an outline representing the heel-part of a last in co-operative relation thereto;

Fig. 3 represents a view similar to Fig. 2

excepting that the last and the gage occupy different positions asv when the trimming cutter is operating at a point near the front of the heel-seat portion;

Fig. a represents a perspective view of the reverse side of the gage;

Fig. 5 represents a sectional view includ ing the trimming cutter and the gage in. cooperative relation, and includes the outline of the crosssection of a last in. a plane at or near the front of the heel-seat portion;

Fig. 6 is a diagram representing conventionally the effect of the gage in displacing the last bodily away from the axis of the cutter;

Fig. 7 is a side elevation of the heel-part of a last on which broken lines are drawn to indicate certain features characteristic of the average last; and

Fig. S is a diagrammatic view representing conventionally the plan contour of the I heel-seat of a last, the contour of the heelseat portion of an insole as trimmed prior to this invention, and the contour of an insole as trimmed according to the present invention.

The gage in which the present invention is shown as being embodied may be applied to any suitable machine provided with means for trimming the edge of an. insole, but for the sake of illustration, and without in any way limiting the invention as to its range of,

application to trimming machines, it is shown by the accompanying drawings in conjunction. with an insole-trimming machine of otherwise well-known construction. Referring first to the general m'ganization of the machine shown, without special reference, for the moment, to the features of the present invention, the standard, pedestal. or main frame of the machine is indicated at 10, and a rotary driven cutter of well -known form is indicated at 11. In the present instance the axis of the cutter is horizontal. and the cutter is affixed to the forward end of a shaft 12 (Fig. which is mounted in suitable hearings in the frame and may be driven by any suitable means, not shown. The machine is preferably provided with a work-support and work-clamping means substantially like those shown and described in United States LettersPa-tent No. 1,295,965. granted March 4-, 1919, on an application of Brown and Macleod. The work-su 'iport in chides a horizontal pin 14- arranged to go into the usual socket 15 in the heel-part of a last such as that indicated at 16. The last pin 14-, as shown, is carried by a movable support which is, in the present instance, a swinging arm 17. This arm is mounted on a fulcrum pin 18 which in turn is carried by and afiixed to a knuckle 19. The knuckle is mounted upon a stationary pin 20 which is affixed to the main frame of the machine and which. extends in a direction at right angles to the axis of the fulcrum pin 18. This form of work-support enables the arm 17 to execute compound angular motion about the axes of the pins 18 and 20, so that the insole 21 which is presumably attached temporarily by tacks or otherwise, to the bottom of the last, may be presented to the cutter in the necessary relation regardless of the size and proportions of the last. The last is, moreover, capable of executing angular motion about the pin 14 to carry the point of contact between the insole and the cutter ru-ogressively along the edge of the insole. In practice the last, having been provided with an insole temporarily attached thereto, will be mounted upon the pin 14: and the su 'morting arm 17 will thereafter be moved manually to present the insole to the cutter and to maintain the last against the bearing points of the gage while the last is turned manually on the pin 14: to promote the trimming ope 'ation progressively along the edge of the insole.

Before explaining the details oi the gage it will be well to consider certain peculiarities of the average last that have been taken into account in the development of the gage. For example, referring to Figs. 2 and 3, the contour of the heel-seat portion of a last is represented by dotted lines and indicated at The plan contour ofthe last in a plane approximately one-half inch from the bottom, .is represented by a continuous line and indicated at 23. Thespace between the two outlines represents the undercut of the last, and it is to be observed that the greatest degree of undercut is at the front oi. the heelseat aortion at each side of the last as at C. he points where the degree of undercut is least are indicated at B, B, while an intermediate degree of undercut characterizes the extreme end of the last as indicated at A. If,in the course of trinnning the heelseat portion of the insohuthe point of cut were caused to follow the contour of the heel-seat portion of the last to the front of said portion the insole would be characterized by abrupt shoulders at the points where the trimming begins and ends, and in order to avoid the formation oi. such shoulders it is necessary to move the work and the cutter relatively toward or from each other gradually as the trimming progresses The irregular undercut formation of the last prohibits the use of a gage arranged to coact with the edge of the heel-seat, and if a gagcis used at all to co-act with the last it must co-act with the bulging portion which, as shown by Figs. 2 and 3, embodies a plan contour that differs materially from the contour of the heel-seat. It the degree of undercut were of the minimum degree at point plained, the degree of undercut at point A is materially greater than that at the intcrmediate points B, B, and if the cutter were permitted to follow a line parallel or substantially parallel to the effective guiding portion of the last, the insole would be cut in too far in the vicinity of points B or else it would not be cut in far enough between those points.

The problem oi? trimming the insole requires relatively close trimming around the end of the last in the segment between the points B, B, but from these points to points C, C the trimmed edge of the insole should diverge gradually from the contour of the heel-seat of the last, and the diverging re lation should begin at or near points B, B in order to avoid. appreciable abnormalities in the contour the finished shoe. The dcsirable result is obtained by the present invention notwithstanding the peculiar conditions of the last as to the irregularities in the degrees oi. undercut at the several points indicated, and this result is represented conventionally in Fig. 8 in which the contour of the trimmed edge is represented by the continuous outline D. It will be observed that this outline substantially parallel and nearly coincidental with the heel seat of the last throughout the segment defined by points B, B notwithstanding variations in the degree oi? undercut oi? the last between said points.

One form of gage capable of producing the result represented by outline D in Fig. 8 is indicated as a whole at In the present instance, the machine being provided with a 'worlrsupport that limits to some extent the path of movement oi the work toward and from the cutter, the gage is mounted so as to be capable of moving relatively to its support so that it may accommodate itscll? auton'iatically as to its position aecording to the positions of the work as controlled by the work-support. The gage is supported by a plate 26 that is suitably recessed to enable the cutter and the insole to occupy the necessary operative relation. This plate is adjustably mounted in. a holder 27, being provided with parallel tongues or flanges arranged in corresponding grooves formed in the holder. An adjusting screw 29 is connected to the holder so as to be capable of rotating relatively thereto but being held against longitudinal movement. The supporting plate 26 is bored. and tapped to receive the adjusting screw. and the latter is provided with a knurled head 30 by which it may be turned manually to adjust the plate and the gage 25, in lines transverse to the axis of the cutter. The holder 27 is, for convenience in giving access to the cutter and for other purposes, mounted upon a fulcrum pin 31, and is capable o'l. swinging upwardly about said pin to an il'ioperative position. The machine may be provided with suitable means, not shown, for securing the swinging holder 27 in operative position, as shown byFig. 1.

In the present instance the connection between the gageand its supporting plate is formed in part by a cylindric boss 32 formed on or aflixed to one of the connected parts. As shown by Figs. 4t and 5 it is formed upon the gage member, and the supporting plate is provided with a hole or socket 233 to receive it. The connection is formed in part also by a screw-stud 8 3:. This stud extends loosely through a segmental slot 35 formed in the member, and is screwed into a tapped hole in the sup porting plate. The screw serves not only to maintain the gage and its supporting plate in connected relation, but it serves to limit the oscillatory movement oi the gage member as the latter turns on the pivot element 32. It is desirable to have the gage member occupy normally an intermediate position between its two extremes of oscillatory motion, and for this reason two tension springs 36, 36 are arranged to exert their stress in opposition to each other to center the gage member. These springs are connected at one end to anchoring screws 37 carried by the supporting plate and at the other end to screws 38 carried by the gage member. The gage is formed to provide two co-operative abutments 410, 10 arranged to co-act simultaneously with the side of the last and to follow a common line of contact along the bulging portion of the last. This line of contact, as it happens, due to the varying degrees of undercut as hereinbefore explained, is not parallel to the general plane of the bottom ofthe last but is relatively close to the bottom in the vicinity of points B and is farther distant from the bottom at other points.

This effective guiding line or line of contact is represented by a broken line in Fig. 7 and is so identified in that figure.

The abutments l0, l0 of the are preferably convexed' substantially as shown, although the degree of convexity and the distance between the abutments are subject to slight variations according to the width of the lasts. As a general rule one ga ge will be suliicient to take care of the majority of mens lasts while a gage of slightly different proportions will be sufficient to take care of the majority of womens lasts. Extreme sizes might require gages of still other proportions, and although they would be exceptional. it would be a simple matter to provide special gages for them.

The abutments 40, 40 are separated from each other by a notch or indentation 41, the width of which is of considerable importance as determining the extent to which the end of the last may enter between the abutments. The depth of the notch or recess is of minor consequence provided it is great enough to permit the end of the last to enter to the maximum exmnt determined by the width. Relatively small lasts, that is last-s whose curvature at the heel end is of relatively short radius, would approach the cutter more closely'than a last having a greater radius or curvature at the same point but the dill'erences are so slight in the ordinary range of sizes that one gage is sullicient for the majority of sizes in one class of work. A gage in which the depression is relatively narrow would be appropriate for 'u'omens lasts.

The last-engaging sur l'aces 42 of the abutmcnts 40 are preferably inclined relatively to the axis of the cutter so as to conjlori'n somewhat to the undercut characteristic of the last. When the end of the last is in the depression of the gage as shown by Fig. 3 its distance from the axis of the cutter is oil the minimum degree, and this distance is indicated comparatively by a curved line but as the last is turned to bring the portions of less our *ature into enga ement with the abutments l0, lO the last displar-cd booily trom the axis of the cutter a distaurc determined by the plan contour ot the olfective guiding iortiou o l? the last, and rep resented by the distance between the curved line E and the curved line F in Fig. (i. This bodily displacement as caused by the conjoint action of the two abutments 40, 40 is neutralized initially by the convergence from point A. to points l.-, but as the point of cut progresses beyond points l the displacement causes the line of triimning to diverge gradually from the contour of the heel-seat of the last. It will be understood, of course, that this client requires two abutments, and that they are adequate, without any extraneous means. to control the separation of the work from the cutter delinitely, positively, and without any calculation, special attention, or special effort on the part of the operator.

.ln addition to the features thus described the invention includes means for guiding the last with respect to its position lengthwise of the axis of the cutter. The guiding means for this purpose is constructed and arranged to engage the bottom of the last and to maintain contact with the last while the abutments 40, -10 are traversing the side oi? the last. In the present instance a third guiding element is formed as an integral part of the gage and is in the form of a lip or flange 43. The gage is thus adapted to maintain three separate points of contact with the last throughout the trim-- ming operation, two of said points of conact determining the distance between the last and the axis of the cutter and the third point serving to maintain the bulging portion of the last in co-opcrative relation to the first two guiding points. It is a wellknown fact that any structure that has three separate points of contact with an object will accommodate itself to all external irregularitiesyol'? the object and maintain a suitable bearing thereon. In the present instance the object with which the gage is called upon to co-operate presents a convexed surface wherever it comes in contact with the gage and as a necessary consequence the gage and the last will always have three points of contact with each other although these points may be movable relatively to each other as the varying curvatures of the last are brought into play.

According to the usual practice in trimming the heel-seat portionv oi. an insole the heel-end of the last is presented first as shown by Fig. 2. The end. of the last enters the notch 41 of the gage sufficiently to compensate for the undercut formation of the last at that point, thus enabling the edge of the heel-seat to approach initially very closely to the cutter. The operator, while pressing the side oil: the last against the abutments 10, 40, will, at the same time, keep the bottom of the last pressed against the flange 43 and will swing the last about the pin 14,

as, for example, in a clockwise direction.

This angular motion of the last about the last-pin will cause the gage to turn initially in a counter-cloclnvise direction, and the side of the last will slide on the abutments 40 as the latter traverse the effective guiding line indicated in Fig. 7. WVhen the last is in its initial position. the two points of contact with the abutments 40, 4.0 are relatively close to each other, but as the curvature of the last diminishes toward the points (3 the points of contact between the side of the last and the abutments move away from each other may be readily unders nod referring to Fig. 3. The last, in consequence of moving from. the position shown by Fig. 2 to that shown by Fig. 3, is displaced bodily from the axis of the cutter, such bodily dis placement being represented. diagrammatically by Fig. 6, and the net result of such displacement being the gradual divergence of the trimmed edge fromthe contour of the heel-seat of the last between the point B and point C as shown b Fig. 8. Although, as previously stated, t. e initial. movement of: the gage is in a counter-clockwise direction, the movement is reversed before the last has completed its angular movement about the the last again to the starting position, as shown by Fig. 2, and will again place the heel-end o:t' the last against the gage preparatory to trimming the opposite edge of the insole. The momentary separation of the last from the gage while returning the last from position it to the starting position. will enable one of the sprii'igs 36 to return the gage to its initial position as shown by liig. 2. Having againplaced the last in the position shown by Fig. 2, the operator'will turn the last in a counter-clockwise direction about the pin 141-, in consequence of which the gage will oscillate initially in a clockwise direction but will thereafter move in the reverse direction as occasion may require to maintain the two points of contact between the abutments 40, 40 and the side of the last.

The phrase side out the last as used in the description and claims is intended to reier to the mustanding surface of the last as distinguished ti-om the bottom, but is not intended to imply any distinct-ion be tween the right and left sides and the back of the heel. In other words the back of the heel is included within the meaning of the phrase under discussion.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent oi the United States is:

.1. In a machine tor trimming the edge oi a sole attached to a last, a trimming cutlei arranged to out along lines substantially parallel to the plane of the sole, and guiding means relatively to which the last is movable, said means being arranged to maintain contact with the side of the last at two separate points simultaneously to guide the work relatively to the cutter so as to vary the depth (it out according to the variant curvature oil the last.

2. In a machine (or trin'uning the edge of a solo attached to a last, a trimming cutter, and guiding means comprising. two bodily movable ubutmeni's relatively to which the last is movable, said abutments being arranged to maintain contact simultaneously with the side of the last in advance of and behind the point of operation, respectively.

3. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, and two complemental abutments movable about a common center and arranged to maintain contact simultaneously with the side of the last to guide the work relatively to the cutter, said abutment-s being separatedto enable the end of the last to enter between them.

t. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, and two movable abutments spaced apart and connected so that movement of one will be transmitted to the other and arranged to maintain contact simultaneously with the side of the last to guide the work relatively to the cutter.

5. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, and two separate abutments fixedly related to each other and arranged to maintain contact simultaneously with the side of the last to guide the work relatively to the cutter, said abutments being movable bodily and collectively by the last as the latter executes angular motion.

6. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, and an oscillatory gage constructed and arranged to have and to maintain separate points of contact with the side of the last to guide the work relatively to the cutter.

7. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, and an oscillatory gage arranged to bear against theside of the last at two separate points simultaneously to guide the work relatively to the last, said gage being movable by the cutter about an axis adjacent to the cutter.

8. In a machine for trimming the edge of a sole attached to a last, a rotary trimming cutter, and an oscillatory gage movable about an axis substantially coincident with that of the cutter and having a non-concentric surface arranged to co-act with the side of the last to guide the work relatively to the cutter. 9. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, and a gage comprising two co-operative abutments of convex form spaced apart and arranged to co-act simultaneously with the side of the last to guide the work relatively to the cutter, said abutments being shiftable to various localities in response to a preponderance of pressure by the last on one of them.

10. In a machine for trimming the edge of asole attached to a last, a trimming cutter, and two separate abutments arranged to contact simultaneously with the side of the last to guide the work relatively to the cutter, said abutments being movable about an axis so as to maintain contact with the last and to conform automatically to the demands of the last.

11. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, two separate abutments arranged to maintain contact simultaneously with the side of the last to guide the work relatively to the cutter, each of saidabutments being movable by'the last, and yielding means arranged normally to position the abutments for starting. 7

12. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, a movable gage constructed and arranged to contact with the side of the last at separate points simultaneously so as to guide the work relatively to the cutter, said gage being movable by the last, means arranged to limit the movement of the gage, and yielding means arranged normally to return the gage to a starting position.

In a machine for trimming the edge oi a sole attached to a last, a trimming cutter, an oscillatory gage constructed and arranged to contact with the side oi the last separate points simultaneously so as to guide the work relatively to the cutter, said gage being movable angularly by the last, means arranged to limit the angular movement of the gage, and yielding means arranged normally to return the gage to a starting position.

14:. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, an oscillatory gage constructed and arranged to contact with the side of the last at sepa rate points simultaneously so as to guide the work relatively to the cutter, said gage be ing movable angularly by the last, means arranged to limit the angular movement of the gage, and yielding means arraiiiged normally to return the gage to an intermediate position between its extreme positions of angular movement.

15. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, guiding means arranged to engage the bottom of the last, and two separate abutments ar'anged to maintain contact simultaneously with the side of the last to guide the work relatively to the cutter, said abutments being adjustable to vary the location of the trimmed edge relatively to the edge of the last.

16. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, a movable gage arranged to contact with the side of the last to guide the work relativel v to the cutter, and means for supporting said gage, said means being adjustable to vary the proximity of the trimmed edge relatively to the edge of the last, and said gage being movable bodily and by the last rel atively to the supporting means.

17. In a machine for trimming the edge of: a sole attached to a last, a trimming cutter, a gage having two separate portions arranged to maintain contact simultaneously with the side of the last to guide the work relatively to the cutter, and a support for said gage, the support being adjustable to vary the proximity of the trimmed edge relatively to the edge of the last, and the being movable by the last so that the line intersecting its two points of contact with the last will shift as the last is moved.

18. In a machine for trimming the edge of a sole attached to a last, a rotary trimming cutter, a gage having two separate portions arranged to maintain contact simultaneously with the side of the last to guide the work relatively to the cutter, an adjust able support for the gage, said gage being movably connected to the support to oscillate about an axis aPPIOXlIIMtlZClY coincident with that of the cutter, and means for adjusting the support to vary the proximity of the trimmed edge relatively to the edge ol': the last.

19. In, a machine for trimming the edge oi a sole attached to a last, a trimming cutter, guiding means arranged to maintain contact with the bottom of the last, and two separate abutments arranged tomaintain contact simultaneously with the side oi. the last, said means and said abutments, conjointly, being arranged to position andv to guide the work relatively to the cutter.

20. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, and a gage comprising two separate abutments arranged to maintain contact simultaneously with the side oil the last and a flange projecting from said abutments to maintain contact with the bottom of the last, said abutments being effective conjointly to determine the proximity 01": the trimmed edge relatively to the edge of the last.

21. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, two separate abutments arranged to maintain contact sinuiltanccusly with the side of the last to determine, conjointly, the proximity of the trimmed edge relatively to the edge of the last, said abutments being movable collectively about an axis in response to angular movement of the last, and means arranged to engage the bottom of the last to maintain the last in operative position relatively to said abutments.

22. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, and means for positioning and guiding the work relatively to the cutter, said means being constructed and arranged to maintain contact with three separate points of the last simultaneously as the last moves relatively thereto to promote the trimming operation progressively.

23. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, and. a gage relatively to which the last is movable to promote the trimming operation progressively, said gage being constructed and. arranged to maintain contact with the bottom and sides oil: the last at three separate points simultaneously as the last moves rela' tively thereto.

24. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, and a gage relatively to which the last is movable to promote the trimming operation progressively, said gage being constructed and arranged to maintain contact with three separate points of the last simultaneously and being movable by the last as the latter executes angular motion.

25. In. a machine liar trimming the edge of a sole attached to a last, a trimming cutter, and a gage relatively to which the last is movable to promote the trimming operation progressively, said gage being constructed and arranged to constitute a movable unit and being so movable as to maintain contact with the side oi the last at two separate points simultaneously as the last progresses,

26. In a machine for trimming the edge of a sole attached to a last, a trimming cutter, and a gage relatively to which the last is movable to ronriote the trimming operation progressively, said, gage being constructed and arranged to maintain contact with the side oi the last at two separate points simultaneously as the lust progresses and having a portion arranged to maintain contact with the bottom oi. the last.

27. In a machine :tor trimming the edge of a sole attached to a last, a trimming cutter, and a gage relatively to which the last is movable to promote the trimming operation progrcssively, said gage having a flange to engage the bottom oi the last and two separate convex portions arranged to maintain contact with the side of the last simultaneously and to traverse a common line of contact with the last.

28. In a. machine for trimming the edge of a sole attached to a last, a trimming cutter, a work-support movable toward and from the cutter and having a pin. arranged to co-act with. u soclret in the heel-part ot the last, and a. movable gage arranged to co-act with the last to guide the worlrrelatively to the cutter, said gage being movable by the last as the latter turns on said. pin, and having two separate portions a1. *anged to traverse the side of the last simultaneously to vary the depth of out according to the degree of cur" vature of the surface traversed thereby.

29. In a machine for trimming the edge of an insole attached to a la st, a trimming cuttor, and worl-:-guid ing means consisting in a member arranged to oscillate and having a flange to engage the bottom oi? the last and two separate shoulders arranged to maintain contact simultaneously with the side of the last;

30. In a machine for trimming the edge of an insole attached to a last, a trimming cutter, and an adjustable unit having a flange arranged to engage the bottom of the last and two separate abutments arranged to engage the side oi? the last, said unit being adjustable to vary the location of the trimmed edge relatively to the edge of the last.

In testimony whereof I have signed my name to this specification.

HORACE D. WEBB,

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,415,966 granted May 16, 1922,

upon the application of Horace D. Vebb, of Rochester, New York, for an improvement in Edge-'lrinnning Machines, errors appear in the printed specification requiring correction as follows: Page 1, line 108, for the Word embodying read employing; page 6, line 23, claim 7, for the Word last read cutter, and line 24, for the Word cutter read last and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the casein the Patent Ofiice.

Signed and sealed this 17th day of October, A. D., 1922.

[SEAL] KARL FENNING,

Assistant Commissioner of Patents. 

